This year Silent Witness celebrates its 20th anniversary with five explosive stories that take the show into new and uncharted territories as well as delving into the murky depths of city life. Five contemporary thrillers that start amongst the familiar landscapes of London and end up in the dusty scrubland of Mexico.。1850德州牧场扎克立家族來了一位流浪汉称扎克立家女儿是印第安凯欧族孤儿,引起凯欧族来此要人,整個问题是因为上一代白人与印第安相互寻仇,白人抱走印第安婴儿回家抚养,而该流浪客的儿子亦被印第安人掳走,向扎克立家族要求以女婴交换其儿子被拒而遭杀害,使其四处追踪迫害,最后水落石出,引起白人和印第安人的交战。